heat transfer with porous media

gokul

my problem was air heater heat transfer with porous.it is have multi blocks each block have same tubes.am give a each block for same porosity for inertial co efficient C2(1/m) and volumetric heat transfer rate(w/m3)and density correction. in this case the the reduced correctly but the density also reduced.

i have a doubt for which one best method for porous media heat transfer in fluent? i am using polynomial method but it will not given proper solution.if any viscosity correction need for that problem? or constant viscosity is enough? any other method to solve my problem?